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首页> 外文期刊>Aquatic Sciences >Beyond nitrogen and phosphorus subsidies: Pacific salmon (Oncorhynchus spp.) as potential vectors of micronutrients
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Beyond nitrogen and phosphorus subsidies: Pacific salmon (Oncorhynchus spp.) as potential vectors of micronutrients

机译：超出氮和磷补贴：太平洋鲑鱼（oncorhynchus spp。）作为微量营养素的潜在载体

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摘要

Large quantities of material are moved annually from the ocean to freshwater systems by migrating Pacific salmon. Previous studies have focused on nitrogen and phosphorus provided by spawning salmon but largely ignored micronutrients essential to aquatic productivity. We collected salmon tissue, water, and biofilm from seven southeast Alaskan streams both before and during the salmon run to test for potential micronutrient provision by salmon and uptake by biofilm. To examine temporal patterns, one stream was also sampled with high frequency. Samples were analyzed using ICP-OES for boron (B), calcium (Ca), cobalt (Co), copper (Cu), iron (Fe), potassium (K), magnesium (Mg), manganese (Mn), molybdenum (Mo), sodium (Na), selenium (Se), silicon (Si), and zinc (Zn). Arrival of salmon increased stream water loads for Ca, Fe, Mg, and Na and the concentration of Co in biofilm across the seven study streams. Stream loads of B and biofilm Cu and Na content decreased in the presence of salmon. By examining one stream at finer temporal resolution, biofilm increased in Ca, Fe, and Mn concentrations near the end of the salmon run, indicating possible lag effects between peak salmon densities and biofilm micronutrient uptake. The increase in stream water micronutrient loads across space for four elements and uptake of three elements in biofilm through time suggest that salmon are a potential source of essential micronutrients for freshwater ecosystems, as has been repeatedly demonstrated for macronutrients. This study expands our understanding of resource subsidies by identifying potential micronutrients important to those ecological dynamics.
机译：通过迁移太平洋鲑鱼，每年从海洋到淡水系统移动大量材料。以前的研究专注于通过产卵三文鱼提供的氮和磷，但大部分忽略了对水生成品的微量营养素。在鲑鱼之前和期间，我们将鲑鱼组织，水和生物膜收集到七个东南阿拉斯加溪流中，以试验鲑鱼和生物膜摄取潜在的微量营养素。为了检查时间图案，还以高频率对一个流进行采样。使用ICP-OES用于硼（B），钙（CA），钴（CO），铜（Cu），铁（Fe），铁（Fe），钾（镁），锰（Mn），钼（Mg），钼（ Mo），钠（Na），硒（Se），硅（Si）和锌（Zn）。鲑鱼增加流水载荷的加入水载荷，七种研究流中的生物膜中的CO浓度。在鲑鱼存在下，B和生物膜Cu和Na含量的流载荷降低。通过在更精细的时间分辨率下检查一个流，Biofilm在鲑鱼的末端附近的Ca，Fe和Mn浓度增加，表明峰鲑鱼密度和生物膜微量营养素摄取之间可能的滞后效应。通过时间增加四种元素的流水微量营养量的流量增加，并通过时间增加了三种元素的吸收，表明鲑鱼是淡水生态系统的必需微量营养素的潜在来源，因为对于MACRORRIELS已经反复证明。本研究通过识别对这些生态动态重要的潜在微量化来扩大对资源补贴的理解。

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